Read moreFrankly its a UI thing. Its not intuative that the other passive trees from the other classes are still available. It looks more like they are visable despite your choice.
One way is with visual effects, obnoxious but usually works. Have each mastery tree pulsate until you click them, then have each passive node on the first row pulsate until you hover over them.
This would clearly indicate that they are options available to you. Without needless handholding.
I also think that making a clearer distinction between available and unavailable skills and passives would help. Maybe make them fade out more or remove coloration. Except for the chain there is no way to tell the difference, and on first glance you can mistake it for a cool visual effect or even just part of the background.
It might also work if you have some sort of visual effect on the mastery tree UI that unlocks your passive trees, have it unlock one with a large effect and the others with ...
I think I'm not understanding some of those suggestions because I think that it already does most of that doesn't it?